The Fei Cui might really be Lu Shuangshuang's close confidant, and they can be said to have grown up together since childhood. Therefore, although Lu Shuangshuang dislikes her appearance, she still trusts her quite a bit.
So Fei Cui knows quite a few things.
After asking everything she wanted to know, there were some things that Fei Cui didn't know, wasn't clear about, and couldn't answer. Only then did she end her interrogation of Fei Cui.
If Lu Shuangshuang really didn't know the truth about the Sixth Young Master's incident back then, it's indeed possible to let her go. Wait until the Sixth Young Master's side is confirmed to be useless before dealing with her.
Chiang Xiao feels that she's gained a lot from this trip, at least she has clarified many things.
The matter of breaking off the engagement, the Sixth Young Master's sweetheart, and also, within the Jiang Family, she has at least caught two spies.
